GCN Circulars
GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"- GRB120308A: MITSuME Ishigakijima Optical Upper Limits
- GRB 120308A: Swift/UVOT Detection
- GRB 120308A: Swift-XRT refined Analysis
- GRB 120308A: Enhanced Swift-XRT position
- GRB 120308A: Swift-BAT refined analysis
- GRB 120308A: IAC80 I-band observations
- GRB 120308A: PAIRITEL NIR observations
- GRB 120308A: confirmation of the optical afterglow
- GRB 120308A: Liverpool Telescope optical afterglow candidate
- GRB 120308A: Swift detection of a burst
- GRB 120305A: D50 optical limits
- GRB 120305A: Swift spectral lag analysis
- GRB 120302A, the review of the sky area in plate archives
- GRB 120302A: Fermi GBM Observation
- GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
- GRB 120305A: Swift/UVOT Upper Limits
- GRB 120305A: EVLA deep limit on a radio counterpart
- GRB 120305A: Swift-XRT refined Analysis
- GRB 120305A: Enhanced Swift-XRT position
- GRB 120305A: Swift-BAT refined analysis
- GRB 120305A - Liverpool Telescope Observations
- GRB 120305A: MASTER-NET early optical observations
- GRB 120305A: Swift detection of a short burst
- GRB 120302A: GROND detection of an afterglow candidate
- GRB 120302A, Swift-BAT refined analysis
- GRB 111222A: Swift observation on 2012 February 06/07
- GRB 120302A found in ground analysis of BAT data
- GRB 120229A: Spectral lag analysis
- GRB 120229A, Swift-BAT refined analysis
- GRB 120229A: Swift detection of a short burst
- Konus-Wind observation of GRB 120226A
- GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
- GRB 120226A: Fermi-LAT data analysis
- IPN Triangulation of GRB 120226A
- GRB 120227A: RAPTOR Limit During the Gamma-Ray Emitting Interval
- GRB 120224A: VLT/X-shooter observations
- GRB 120224A: optical observation in Mondy observatory
- GRB 120226A: Fermi-LAT detection of a burst
- GRB 120224A: GROND detection of the afterglow candidate
- GRB 120219A, the review of the sky area in plate archives
- GRB 120224A: Swift-XRT refined Analysis
- Swift Trigger 516027 is CC Eri
- GRB 120224A: Swift/UVOT Upper Limits
- GRB 120224A: Swift-BAT refined analysis
- GRB 120224A: FTN optical observations
- GRB 120224A: Enhanced Swift-XRT position
- GRB 120224A: Swift detection of a burst
- GRB_120215, the_review_of_the_sky_area_in_plate_archives
- GRB 1202019A: optical observation in Mondy observatory
- GRB 120219A: MASTER prompt and early optical limit and OT discussion
- GRB 120219A: 1.23m CAHA optical observations
- GCN 12974 : Errata in the Subject
- GRB 120219A, optical observations
- GRB120219A: Keck Observations
- GRB 120215A: MITSuME Akeno Optical upper limits
- GRB 120219A: Swift-XRT refined Analysis
- GRB 120219A: Swift/UVOT Upper Limits
- GRB 120219A: MITSuME Okayama Optical upper limits
- GRB 120219A: Swift-BAT refined analysis
- GRB 120219A: Enhanced Swift-XRT position
- GRB120219A: TNT optical afterglow candidates
- GRB 120219A: MASTER-NET prompt and early optical observations
- GRB 120219A: Swift detection of a burst
- GRB 120218A: Swift-BAT refined analysis
- GRB 120218A: Swift detection of a burst
- GRB 120215A: Swift/UVOT Upper Limits
- GRB 120215A: MITSuME Okayama Optical upper limits
- GRB 120215A: Swift-XRT refined Analysis
- Fermi GBM detection of an SGR-like burst
- GRB 120215A: Enhanced Swift-XRT position
- Skynet/PROMPT observations of GRB120215A
- GRB 120215A: Swift-BAT refined analysis
- GRB 120215A: Swift detection of a burst
- GRB 120211A : LOAO optical observations
- GRB 120213A: Swift-XRT refined Analysis
- GRB 120213A: Swift/UVOT Upper Limits
- GRB 120212A: Fermi GBM observation
- GRB 120212A: GMG optical observation
- GRB 120213A: Enhanced Swift-XRT position
- GRB 120212A: MITSuME Ishigakijima Optical Observation
- GRB 120213A: Swift-BAT refined analysis
- GRB 120213A: MASTER-NET early optical observations
- GRB 120213A: Prompt enhanced Swift-XRT position
- GRB 120212A: Swift-XRT refined Analysis
- GRB 120213A: Swift detection of a burst
- GRB 120212A: NOT optical observation
- GRB 120212A: Swift/UVOT Detection
- GRB 120212A: Swift-BAT refined analysis
- GRB 120212A: Errata of subject in GCNC 12936
- GRB 120212A: Enhanced Swift-XRT position
- GRB 120211A: MITSuME Okayama Ks-band Observation
- GRB 120212A: Kanata/HOWPol optical observation
- GRB 120212A: Swift-XRT observations
- GRB 120212A: Swift/UVOT detection
- GRB 120212A: Faulkes Telescope South afterglow candidate
- GRB 120211A: GROND Upper limits
- GRB 120212A: Swift detection of a burst
- GRB 120211A: MITSuME Okayama and Ishigakijima Optical upper limits
- GRB 120211A, optical observations
- GRB 120211A: Swift-XRT refined Analysis